forked from Imagelibrary/rtems
465 lines
12 KiB
C
465 lines
12 KiB
C
/*
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* Copyright (c) 2005 Martin Decky
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* - The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Modifications are made to compile for RTEMS. Removes asm.h and printf.h.
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* Adds asm.h (rtems bsp). Adds ofw_read() and ofw_stdin variable. Uses
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* printk instead of puts for error messages.
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*
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*/
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#include <bsp.h>
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#include <rtems/bspIo.h>
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#include <boot/ofw.h>
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#include <boot/ofwarch.h>
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#if 0
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#include <boot/printf.h>
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#include <boot/asm.h>
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#endif
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#include <boot/types.h>
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#include <string.h>
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#include <asm.h>
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#define RED(i) (((i) >> 5) & ((1 << 3) - 1))
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#define GREEN(i) (((i) >> 3) & ((1 << 2) - 1))
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#define BLUE(i) ((i) & ((1 << 3) - 1))
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#define CLIP(i) ((i) <= 255 ? (i) : 255)
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uintptr_t ofw_cif;
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phandle ofw_chosen;
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ihandle ofw_stdout;
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ihandle ofw_stdin;
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phandle ofw_root;
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ihandle ofw_mmu;
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ihandle ofw_memory_prop;
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phandle ofw_memory;
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void ofw_init(void)
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{
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ofw_chosen = ofw_find_device("/chosen");
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if (ofw_chosen == -1)
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halt();
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if (ofw_get_property(ofw_chosen, "stdout", &ofw_stdout,
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sizeof(ofw_stdout)) <= 0)
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ofw_stdout = 0;
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if (ofw_get_property(ofw_chosen, "stdin", &ofw_stdin,
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sizeof(ofw_stdin)) <= 0)
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ofw_stdin = 0;
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ofw_root = ofw_find_device("/");
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if (ofw_root == -1) {
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printk("\r\nError: Unable to find / device, halted.\r\n");
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halt();
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}
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if (ofw_get_property(ofw_chosen, "mmu", &ofw_mmu,
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sizeof(ofw_mmu)) <= 0) {
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printk("\r\nError: Unable to get mmu property, halted.\r\n");
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halt();
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}
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if (ofw_get_property(ofw_chosen, "memory", &ofw_memory_prop,
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sizeof(ofw_memory_prop)) <= 0) {
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printk("\r\nError: Unable to get memory property, halted.\r\n");
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halt();
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}
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ofw_memory = ofw_find_device("/memory");
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if (ofw_memory == -1) {
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printk("\r\nError: Unable to find /memory device, halted.\r\n");
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halt();
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}
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}
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/** Perform a call to OpenFirmware client interface.
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*
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* @param service String identifying the service requested.
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* @param nargs Number of input arguments.
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* @param nret Number of output arguments. This includes the return
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* value.
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* @param rets Buffer for output arguments or NULL. The buffer must
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* accommodate nret - 1 items.
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*
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* @return Return value returned by the client interface.
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*
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*/
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unsigned long
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ofw_call(const char *service, const int nargs, const int nret, ofw_arg_t *rets,
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...)
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{
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va_list list;
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ofw_args_t args;
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int i;
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args.service = (ofw_arg_t) service;
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args.nargs = nargs;
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args.nret = nret;
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va_start(list, rets);
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for (i = 0; i < nargs; i++)
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args.args[i] = va_arg(list, ofw_arg_t);
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va_end(list);
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for (i = 0; i < nret; i++)
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args.args[i + nargs] = 0;
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(void) ofw(&args);
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for (i = 1; i < nret; i++)
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rets[i - 1] = args.args[i + nargs];
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return args.args[nargs];
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}
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phandle ofw_find_device(const char *name)
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{
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return ofw_call("finddevice", 1, 1, NULL, name);
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}
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int ofw_get_property(const phandle device, const char *name, void *buf,
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const int buflen)
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{
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return ofw_call("getprop", 4, 1, NULL, device, name, buf, buflen);
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}
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int ofw_get_proplen(const phandle device, const char *name)
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{
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return ofw_call("getproplen", 2, 1, NULL, device, name);
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}
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int ofw_next_property(const phandle device, char *previous, char *buf)
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{
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return ofw_call("nextprop", 3, 1, NULL, device, previous, buf);
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}
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int ofw_package_to_path(const phandle device, char *buf, const int buflen)
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{
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return ofw_call("package-to-path", 3, 1, NULL, device, buf, buflen);
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}
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unsigned int ofw_get_address_cells(const phandle device)
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{
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unsigned int ret = 1;
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if (ofw_get_property(device, "#address-cells", &ret, sizeof(ret)) <= 0)
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if (ofw_get_property(ofw_root, "#address-cells", &ret,
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sizeof(ret)) <= 0)
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ret = OFW_ADDRESS_CELLS;
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return ret;
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}
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unsigned int ofw_get_size_cells(const phandle device)
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{
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unsigned int ret;
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if (ofw_get_property(device, "#size-cells", &ret, sizeof(ret)) <= 0)
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if (ofw_get_property(ofw_root, "#size-cells", &ret,
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sizeof(ret)) <= 0)
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ret = OFW_SIZE_CELLS;
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return ret;
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}
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phandle ofw_get_child_node(const phandle node)
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{
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return ofw_call("child", 1, 1, NULL, node);
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}
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phandle ofw_get_peer_node(const phandle node)
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{
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return ofw_call("peer", 1, 1, NULL, node);
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}
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static ihandle ofw_open(const char *name)
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{
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return ofw_call("open", 1, 1, NULL, name);
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}
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void ofw_write(const char *str, const int len)
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{
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if (ofw_stdout == 0)
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return;
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ofw_call("write", 3, 1, NULL, ofw_stdout, str, len);
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}
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void ofw_read(void *str, const int len)
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{
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if (ofw_stdin == 0)
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return;
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ofw_call("read", 3, 1, NULL, ofw_stdin, str, len);
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}
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void *ofw_translate(const void *virt)
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{
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ofw_arg_t result[4];
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int shift;
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if (ofw_call("call-method", 4, 5, result, "translate", ofw_mmu,
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virt, 0) != 0) {
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printk("Error: MMU method translate() failed, halting.\n");
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halt();
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}
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if (ofw_translate_failed(result[0]))
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return NULL;
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if (sizeof(unative_t) == 8)
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shift = 32;
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else
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shift = 0;
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return (void *) ((result[2] << shift) | result[3]);
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}
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void *ofw_claim_virt(const void *virt, const unsigned int len)
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{
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ofw_arg_t retaddr;
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if (ofw_call("call-method", 5, 2, &retaddr, "claim", ofw_mmu, 0, len,
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virt) != 0) {
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printk("Error: MMU method claim() failed, halting.\n");
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halt();
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}
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return (void *) retaddr;
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}
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static void *ofw_claim_phys_internal(const void *phys, const unsigned int len, const unsigned int alignment)
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{
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/*
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* Note that the return value check will help
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* us to discover conflicts between OpenFirmware
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* allocations and our use of physical memory.
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* It is better to detect collisions here
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* than to cope with weird errors later.
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*
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* So this is really not to make the loader
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* more generic; it is here for debugging
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* purposes.
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*/
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if (sizeof(unative_t) == 8) {
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ofw_arg_t retaddr[2];
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int shift = 32;
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if (ofw_call("call-method", 6, 3, retaddr, "claim",
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ofw_memory_prop, alignment, len, ((uintptr_t) phys) >> shift,
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((uintptr_t) phys) & ((uint32_t) -1)) != 0) {
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printk("Error: memory method claim() failed, halting.\n");
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halt();
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}
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return (void *) ((retaddr[0] << shift) | retaddr[1]);
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} else {
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ofw_arg_t retaddr[1];
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if (ofw_call("call-method", 5, 2, retaddr, "claim",
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ofw_memory_prop, alignment, len, (uintptr_t) phys) != 0) {
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printk("Error: memory method claim() failed, halting.\n");
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halt();
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}
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return (void *) retaddr[0];
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}
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}
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void *ofw_claim_phys(const void *phys, const unsigned int len)
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{
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return ofw_claim_phys_internal(phys, len, 0);
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}
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void *ofw_claim_phys_any(const unsigned int len, const unsigned int alignment)
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{
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return ofw_claim_phys_internal(NULL, len, alignment);
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}
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int ofw_map(const void *phys, const void *virt, const unsigned int size, const int mode)
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{
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uintptr_t phys_hi, phys_lo;
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if (sizeof(unative_t) == 8) {
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int shift = 32;
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phys_hi = (uintptr_t) phys >> shift;
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phys_lo = (uintptr_t) phys & 0xffffffff;
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} else {
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phys_hi = 0;
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phys_lo = (uintptr_t) phys;
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}
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return ofw_call("call-method", 7, 1, NULL, "map", ofw_mmu, mode, size,
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virt, phys_hi, phys_lo);
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}
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/** Save OpenFirmware physical memory map.
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*
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* @param map Memory map structure where the map will be saved.
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*
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* @return Zero on failure, non-zero on success.
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*/
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int ofw_memmap(memmap_t *map)
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{
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unsigned int ac = ofw_get_address_cells(ofw_memory) /
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(sizeof(uintptr_t) / sizeof(uint32_t));
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unsigned int sc = ofw_get_size_cells(ofw_memory) /
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(sizeof(uintptr_t) / sizeof(uint32_t));
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uintptr_t buf[((ac + sc) * MEMMAP_MAX_RECORDS)];
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int ret = ofw_get_property(ofw_memory, "reg", buf, sizeof(buf));
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if (ret <= 0) /* ret is the number of written bytes */
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return false;
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int pos;
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map->total = 0;
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map->count = 0;
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for (pos = 0; (pos < ret / sizeof(uintptr_t)) &&
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(map->count < MEMMAP_MAX_RECORDS); pos += ac + sc) {
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void *start = (void *) (buf[pos + ac - 1]);
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unsigned int size = buf[pos + ac + sc - 1];
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/*
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* This is a hot fix of the issue which occurs on machines
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* where there are holes in the physical memory (such as
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* SunBlade 1500). Should we detect a hole in the physical
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* memory, we will ignore any memory detected behind
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* the hole and pretend the hole does not exist.
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*/
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if ((map->count > 0) && (map->zones[map->count - 1].start +
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map->zones[map->count - 1].size < start))
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break;
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if (size > 0) {
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map->zones[map->count].start = start;
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map->zones[map->count].size = size;
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map->count++;
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map->total += size;
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}
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}
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return true;
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}
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static void ofw_setup_screen(phandle handle)
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{
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/* Check for device type */
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char device_type[OFW_TREE_PROPERTY_MAX_VALUELEN];
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if (ofw_get_property(handle, "device_type", device_type, OFW_TREE_PROPERTY_MAX_VALUELEN) <= 0)
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return;
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device_type[OFW_TREE_PROPERTY_MAX_VALUELEN - 1] = '\0';
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if (strcmp(device_type, "display") != 0)
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return;
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/* Check for 8 bit depth */
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uint32_t depth;
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if (ofw_get_property(handle, "depth", &depth, sizeof(uint32_t)) <= 0)
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depth = 0;
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/* Get device path */
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static char path[OFW_TREE_PATH_MAX_LEN + 1];
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size_t len = ofw_package_to_path(handle, path, OFW_TREE_PATH_MAX_LEN);
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if (len == -1)
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return;
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path[len] = '\0';
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/* Open the display to initialize it */
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ihandle screen = ofw_open(path);
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if (screen == -1)
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return;
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if (depth == 8) {
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/* Setup the palette so that the (inverted) 3:2:3 scheme is usable */
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unsigned int i;
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for (i = 0; i < 256; i++) {
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ofw_call("call-method", 6, 1, NULL, "color!", screen,
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255 - i, CLIP(BLUE(i) * 37), GREEN(i) * 85, CLIP(RED(i) * 37));
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}
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}
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}
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static void ofw_setup_screens_internal(phandle current)
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{
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while ((current != 0) && (current != -1)) {
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ofw_setup_screen(current);
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/*
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* Recursively process the potential child node.
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*/
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phandle child = ofw_get_child_node(current);
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if ((child != 0) && (child != -1))
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ofw_setup_screens_internal(child);
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/*
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* Iteratively process the next peer node.
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* Note that recursion is a bad idea here.
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* Due to the topology of the OpenFirmware device tree,
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* the nesting of peer nodes could be to wide and the
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* risk of overflowing the stack is too real.
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*/
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phandle peer = ofw_get_peer_node(current);
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if ((peer != 0) && (peer != -1)) {
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current = peer;
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/*
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* Process the peer in next iteration.
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*/
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continue;
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}
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/*
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* No more peers on this level.
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*/
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break;
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}
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}
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/** Setup all screens which can be detected.
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*
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* Open all screens which can be detected and set up the palette for the 8-bit
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* color depth configuration so that the 3:2:3 color scheme can be used.
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* Check that setting the palette makes sense (the color depth is not greater
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* than 8).
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*
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*/
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void ofw_setup_screens(void)
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{
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ofw_setup_screens_internal(ofw_root);
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}
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void ofw_quiesce(void)
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{
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ofw_call("quiesce", 0, 0, NULL);
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}
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